at com.mycompany.webapp.action.UserActionTest

    public void testSaveConflictingUser() throws Exception {
        .......
        // e-mail address from existing user
        User existingUser = (User) userManager.getUsers().get(0);
        // userManager.getUsers().get(0) will get same user on db2!!!
        // need add two rows below to insure get right(exiting user) user,not same user
        if(user.getId()==existingUser.getId())
                existingUser = (User) userManager.getUsers().get(1);